Evaluation and Analysis of the Components of Management Water Requirement

Research on water management for the oaddv irrigation area controlled by open channel system concerning diversion weir operation (II)

Abstract

From the viewpoint of irrigation water project, an observational study has been performed on management water requirement which is one of the structual elements of irrigation water requirement in the actual observation area having open channel system in “Fukuokazeki”from 1981 to 1989.And its analytical results were summarized as follow.
(1) In this area.both lot?management water reauirement and canal-system-management water requirement being observed at the same time, it was clarified that these waters could be compensate for each other in the farm level.
(2) Mechanism of occurrence of maintenance water for necessary water depth was theoretically made clear, and the water consisted of a large part of canal-system-management water.
(3) The canal-system-management water requirement occured in branch canal has closely relation to the labour of water management and also that water clearly has the function in compensation for labour of water management.
(4) Direction for analysis of design of paddy field irrigation could be shown from the standpoint of quantitative evaluation of management water requirement.